Automatic switch.



F. A. LUNDQUIST. AUTOMATIC SWITCH.

APPLICATION FILED APR. 19. 1911.

1,287,? 1 6. Patented Dec. 17, 1918;

25, individual to the tested line, which energization is caused in a manner to be described. If all the lines in the first group are busy, a circuit wilt now be completed from ground 24, through the frontcontacts and armatures of relays 25, 23", 25", 25', 25, springs 23, winding of magnet 8, springs 20, l!) to battery and ground. The magnet 8, being energized in this circuit, cl s contact springs iii, 27 and releases brush shaft 1.

\till-f be maintained until a groupot' lines, one" or more of which is idle, is found. \Vhen such a group is encountered this circuit will be broken at the contact of a relay 23, a "at'ed with the idle line, and magnet S wilt deeiiergize, arresting the travel of the shaft 1 with test wiper 2 one-halt' step above the contact of the first line in the selected grouplj During the fall of brush shaft 1, the magnets l2 andill are held energized over a circuit trom'grounded battery, springs 27, 2G, springs 17, 16. shat't l, conductor '28,

wiper t6) (position through the windings 'ot' magnets 12 and H to ground. Iipon the deentagization of magnet 8 this circuit is brokenfby theopening of springs '26, 27 and magnet- 14 deenergizes, but magnet 12, being slow to release, is maintained energized untilthe wiper 2 has been brought into contact with the test termipal of the first line in the group by the deenergization of magnet 14. Should this line be busy, a circuit would be completed from battery, found on the test terminal, shaft 1, conductor 28, wiper 40 (position 2'), through the windings ot magnets l2 and II. to ground. Magnet It would be again energized, stepping the, wiper 2' halt-way to the next terminal, and intert-rupting its circuit so that, upon deenergization, the wiper 2 would be brought into contact with said terminal. So long as busy terminals are encountered, the wiper 2 is stepped in this way by the action of the magnet l-l until an idle line is reached, at which time, no battery potential being found on the test. terminal, magnet ll remains deenergized, and magnet I2 dei nergizes and moves wipers 3 and et) into position 1-).

In this position of the side switch a circuit is completed trom grounded battery, through winding of the cut-oil relay 238, wiper 3!) (position 3), conductor 2%, brush shaft 1, wiper 2, selected terminal I, \xinding of relay 25 to ground. Both relays 38 and 25 attract their armatures in this cir- 'Ihe circuit for magnet 8' cuit, but their resistances are adjusted so that battery potential will predominate on the contact I of the selected line andits multiples before other switches, thus denoting the busy condition-of the selected line. The brushes 41 now rest on the terminals of an idle line which may lead either to a selector switch or an operator, and the subscriber may now complete his connection in the usual manner.

'hat is claimed is:

I. In an automatic switch, a brush shat't, a brush on said shatt. a series of contacts arranged in alinement and divided into groups arranged to he. engaged by said brush, a supporting member, means for moving said shalt relative to said supporting member to move said brush from one group of contacts to another, and means tor moving said support to move said brush from contact to contact in a group.

2. Inan automatic switch, a shatt, a brush carried thereby, a-scries of contacts arranged in alinenienl and divided into groups arranged to be engaged by said brush, a support in which 'said shaft is longitudinally movable, means For moving said shaft relative to said support to move said brush from group to group of said contacts, and

means for moving said support 'to move said brush from contact to contact in a group.

In an automatic switch, a shaft, a, brush carried thereon, a series ot' contacts divided into groups arranged to be engaged by said brush, a support, on which said shaft is longitudinally movable, ratchet teeth on said shat't corresponding to said groups of contacts, a pawl for engaging said ratchet teeth, a magnet tor retracting said pawl to permit said shaft to move relatively to said support, whereby said brush will move from group to group of said contacts, meansfor releasing said support, and means for thereupon controlling the movement of said support to move said brush trom contact to contact in a selected group.

1. In an automatic switch, a shaft movable only in a longitudinal direction, a bruslncan ried thereby, a support in which said shaft is movable, means for moving said shat't relative to said support and means t'or moving said support and shaft together in a longitudinal direction.

In witness whereof, my name this ltlth day FRANK III N DQI L "If.

I hereunto subscribe ot April, A. 1). 1917. 

